rvt_lookup_qpn(9)

💖 rvt_lookup_qpn(9) 💖

okay so bestie, welcome to the Kernel API Manual, section 9 — this is the page for rvt_lookup_qpn, and no cap it's a little one but it's important, so pay attention 🎀

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✨ NAME ✨

rvt_lookup_qpn — return the QP with the given QPN 🦋

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🌸 SYNOPSIS 🌸

struct rvt_qp * rvt_lookup_qpn (struct rvt_dev_info *rdi , struct
       rvt_ibport *rvp , u32 qpn );

like, it literally hands you back a struct rvt_qp *, periodt 💅

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🎀 ARGUMENTS 🎀

• rdi — the rvt device info structure 🧚
• rvp — the ibport, iykyk
• qpn — the QP number you're trying to look up 🔍

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💜 DESCRIPTION 💜

okay so this is the part where you have to be a responsible main character: the caller must hold the rcu_read_lock, and keep holding that lock until the returned qp is no longer in use. like, do not let go early. that's the whole vibe check 😭🔒

fr fr, the returned qp is only safe while you're still holding the lock — release it too soon and you're on your own 🙈

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🌈 SEE ALSO 🌈

Kernel file ./include/rdma/rdmavt_qp.h 💖 and also all of these iconic little friends:

• struct rvt_ud_wr(9)
• struct rvt_krwq(9)
• rvt_get_swqe_ah_attr(9)
• rvt_get_swqe_remote_qpn(9)
• rvt_get_swqe_remote_qkey(9)
• rvt_get_swqe_pkey_index(9)
• rvt_get_rq_count(9)
• struct rvt_operation_params(9)
• rvt_is_user_qp(9)
• rvt_get_qp(9)
• rvt_put_qp(9)
• rvt_put_swqe(9)
• rvt_qp_wqe_reserve(9)
• rvt_qp_wqe_unreserve(9)
• rvt_div_round_up_mtu(9)
• rvt_div_mtu(9)
• rvt_timeout_to_jiffies(9)
• rvt_mod_retry_timer_ext(9)
• rvt_put_qp_swqe(9)
• rvt_qp_swqe_incr(9)
• rvt_recv_cq(9)
• rvt_send_cq(9)
• rvt_qp_complete_swqe(9)
• struct rvt_qp_iter(9)
• ib_cq_tail(9)
• ib_cq_head(9)
• rvt_free_rq(9)
• rvt_to_iport(9)
• rvt_rc_credit_avail(9)

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and that's the whole page, bestie 🫶 this cutie lives in the source dir ./include/rdma, dated October 2026, and yes it's still rvt_lookup_qpn(9) — slay, go hold that rcu lock 💅✨🍓